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Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Brand Mortgage Group, LLC |  |
Business Acquisition [Line Items] |  |
Interest income | $ 357 |
Interest expense | 279 |
Net interest income | 78 |
Noninterest income | 4,043 |
Noninterest expense | 4,398 |
Net income before taxes | (277) |
Metropolitan Bancgroup, Inc. |  |
Business Acquisition [Line Items] |  |
Net interest income | 455,513 | $ 450,353
Noninterest income | 153,850 | 176,699
Noninterest expense | 452,699 | 422,700
Net income before taxes | $ 115,646 | $ 105,729
Earnings per share - pro forma: |  |
Basic (usd per share) | $ 1.97 | $ 1.80
Diluted (usd per share) | $ 1.97 | $ 1.80

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